First and second electronic labels, the labels having respective first and second near-field electronic communications means suitable for being activated by applying a magnetic field. Since the circuit board may implement fineness of the first via while forming the first metal layer to be thicker than the related art, warpage may be decreased and heat dissipation performance may be improved. The dried foil is then formed into a desired object shape, and permanently hardened by a ceramic firing process. A base plate has a center located on the central axis of the shaft. The covering mix comprises a butyl rubber and the covering mix comprises a plasticiser of the type unsaturated C12-C22 fatty acid ester. The gas collection means has at least one elongate tube.